*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    list-style: none;
    text-decoration: none;
    font-family: "微软雅黑";
}
.container{
    width: 1150px;
    margin: auto;
}
nav{
    background: #000;
    overflow: hidden;
}
nav li{
    float: left;
}
nav a{
    color: #fff;
    font-size: 14px;
    padding: 24px 20px;
    display: block;
}
nav a:hover{
    background: #fff;
    color: #000;
}
nav .active {
    background:#fff;
    color: #000;
}
.banner{
    background: #2ba3d4;
    text-align: center;
    padding-top: 130px;
    padding-bottom: 130px;
    color: #fff;
}
.banner img{
    margin-bottom: 30px;
}
.banner p{
    margin-bottom: 30px;
}
.banner a{
    color: #2ba3d4;
    padding: 18px 28px;
    background: #fff;
    display: inline-block;
    border-radius: 5px;
    border: 1px solid #fff;
}
.banner a:hover{
    background: #2ba3d4;
    color: #fff;
}
.become{
    padding-top: 150px;
    padding-bottom: 150px;
    text-align: center;
}
.become h3{
    font-size: 25px;    
    margin-bottom: 5px;
    margin-top: 5px;
    font-weight: 200;
}
.become h2{
    font-size: 43px;
    margin-bottom: 50px;
    font-weight: 300;
}
.become p{
    font-size: 14px;
    
}
.row{
    margin-left: -15px;
    margin-right: -15px;
    overflow: hidden;
}
.col-4{
    width: 33.333333%;
    float: left;
    padding: 15px;
}
footer{
    background: #252525;
    padding-top: 100px;
    padding-bottom: 100px;
}
footer p{
    text-align: center;
      color: aliceblue;
}
.item{
    border: 1px solid #e5e5e5;
    border-bottom-color: #0ba1b8;
    padding: 15px;
    padding-bottom: 75px;
}
@media (max-width:600px) {
    .container{
        width: 100%;
    }
    .col-4{
        width:100%;
    }
    .row{
        margin: 0;
    }
    footer p{
        width: 80%;
        margin: auto;
    }
}